Microdosimeter Cell Array for Cellular-Level Radiation Detection
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Solution Overview
Problem
Current radiation dosimetry methods, such as TEPCs and solid state detectors, face limitations in accurately measuring radiation energy deposition at the cellular level due to large size, power requirements, and inability to distinguish energy deposition in small volumes, leading to inaccuracies in radiobiological effect prediction.
Innovation Solution
A microdosimeter cell array with semiconductor volumes designed to mimic the size, shape, and conductivity of biological cells or cell components, generating currents in response to incident radiation, and processed to provide accurate radiation absorption measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If TEPCs are used for radiation dosimetry measurements, then radiation energy deposition can be measured, but the device size is large (1 cm or larger in diameter) which severely limits spatial resolution
Solution Approach 1:
The invention divides the detection system into multiple small semiconductor detector elements arranged in an array, where each element acts as an independent detection unit. This segmentation allows the system to achieve high spatial resolution by using many small detectors rather than one large detector, directly resolving the contradiction between measurement precision and device size.
Solution Approach 2:
The invention transitions from single-point or single-volume measurement to a two-dimensional or three-dimensional array of detector elements. By adding spatial dimensions through the array configuration, the system achieves comprehensive spatial resolution across multiple dimensions while keeping each individual detector element small.
2Measurement precision
If TEPCs are used for radiation dosimetry, then radiation measurements can be performed, but high voltages (2,000 volts or more) are required making the device power-hungry and unable to operate passively for extended periods
Solution Approach 1:
The invention replaces the gas-filled proportional counter mechanism with solid-state semiconductor detectors. This substitution eliminates the need for high voltage operation and gas supply systems, dramatically reducing power consumption while maintaining radiation measurement capability. The semiconductor detectors can operate with much lower voltages and can be integrated with passive readout circuits.
Solution Approach 2:
The semiconductor detector array can be designed with integrated readout circuits and memory elements that allow the detectors to store radiation event information locally. This self-service capability enables passive operation for extended periods without continuous power supply, as the detectors can accumulate and retain data until readout.
3Measurement precision
If TEPCs are used for microdosimetry, then radiation energy deposition can be measured, but very large volume correction factors (e.g., 18,000 times or more) are required to compensate for the difference between TEPC volume and tissue structure volume
Solution Approach 1:
The invention creates detectors that are scaled copies of the actual biological structures being studied. By fabricating semiconductor detectors with dimensions and geometries that match cellular and subcellular structures, the detectors directly replicate the target volume without requiring large correction factors. This copying approach allows measurements to be taken at the appropriate scale from the beginning.
Solution Approach 2:
The invention fundamentally changes the size parameter of the detector from macroscopic (cm scale) to microscopic (µm or sub-µm scale). This parameter change brings the detector volume into direct correspondence with biological structure volumes, eliminating the need for large volume correction factors and simplifying the measurement system.
4Measurement precision
If solid state detectors are used with small sensitive volumes to improve spatial resolution, then radiation energy deposition in small volumes can be measured, but the detectors cannot distinguish energy deposition events in individual cells
Solution Approach 1:
The invention segments the detector array into individually addressable elements, where each element corresponds to a specific spatial location. This segmentation allows the system to distinguish energy deposition events in individual cells by identifying which specific detector element registered the event, thereby preserving spatial information while maintaining small sensitive volumes.
Solution Approach 2:
The invention introduces tissue-equivalent materials as intermediaries between the radiation field and the semiconductor detectors. These materials (such as plastic scintillators or tissue-equivalent plastics) couple to the detectors and help translate radiation interactions into detectable signals while preserving the spatial and energy information. The intermediary layer enables the detectors to distinguish individual energy deposition events even at small volumes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables precise measurement of radiation absorbed by biological cells, reducing the Radiation Detector Correction Factor and improving the accuracy of radiobiological effect prediction by closely approximating the radiation absorption characteristics of specific cell types.
Implementation Method 1
a first semiconductor volume configured to generate a first current in response to incident radiation
Data Source
AI summary
One feature pertains to a radiation dosimeter comprising a microdosimeter cell array that includes a first microdosimeter cell having a first semiconductor volume configured to generate a first current in response to incident radiation. The first semiconductor volume may have at least one of a first size, a first shape, a first semiconductor type, and/or a first semiconductor doping type and concentration that is associated with a first biological cell type or a first biological cell component type. The dosimeter may further comprise a processing circuit communicatively coupled to the microdosimeter cell array and configured to generate a signal based on the first current. The signal generated may be indicative of an amount of radiation absorbed by the microdosimeter cell array. A display may be utilized by the dosimeter to show a radiation level reading based on the signal generated.